OTA
William Optics Ritchey–Chrétien Telescope
William Optics · Ritchey–Chrétien Telescope · 9.75-inch Ritchey-Chrétien (RC) telescope
Key specifications
| Aperture | 250 mm |
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| Focal length | 2000 mm |
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| Focal ratio | f/8.0 |
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| Optical design | Ritchey-Chrétien |
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| Weight | 15.8 kg |
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All specifications
| Focuser type | 10:1 rack-and-pinion linear, 3 inch |
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About
A 250 mm f/8 Ritchey-Chretien on hyperbolic mirrors of 94% reflectivity, covering more than a 44 mm image circle, with a 3-inch 10:1 linear rack-and-pinion focuser. Takes the Dr. Flat Master 0.8x reducer. Sold to order in 10, 12, 14 and 16-inch apertures.